Xerox 4112-4127 Enterprise Printing System-192 - Manual (Page 126)

Specifying input parameters
2-18 Using LCDS Print Description Language
BLOCK command: points to note
Note the following when using the BLOCK command:
•
The values for LTHFLD, OFFSET, FORMAT, and
PREAMBLE may be overridden if RECORD STRUCTURE is
changed as the result of ANSI or IBM OS/Standard label
processing.
• The length of the block delimiter constant should not be
coded as the BLOCK POSTAMBLE. Both lengths are
subtracted from the end of the block.
• The search for the block delimiter constant starts after the
block preamble and proceeds forward to the first appearance
of the constant.
• Using online JDEs in offline JDLs: An offline JDL
statement set that modifies the system default values,
specifically in the BLOCK or RECORD commands, may
experience incorrect results if an online job (JDE) is running.
In other words, if an online JDE is specified in an offline JDL
that has changed the system default values of the BLOCK
and RECORD command parameters, the job may not print
correctly. You should separate and run online and offline jobs
(JDEs) independently of each other.
CAUTION
If a block delimiter constant is positioned and is part of a record
or block, the record or block is truncated. As a result, the data is
not formatted as specified.
Block command example
The BLOCK command for the example in the following figure
would be coded as follows:
The following diagram shows sample values for BLOCK
command parameters.
BLOCK LENGTH=351, OFFSET=2, ADJUST=0,
LTHFLD=2, PREAMBLE=8, FORMAT=BIN;